Date: Tue, 26 May 1998 20:19:40 -0700 (PDT) From: Doug White <dwhite@gdi.uoregon.edu> To: Greg Lehey <grog@lemis.com> Cc: dyson@FreeBSD.ORG, lfloyd@sonic.net, freebsd-questions@FreeBSD.ORG Subject: Re: Compatibility with Ultra IDE drives? Message-ID: <Pine.BSF.3.96.980526201921.13318U-100000@gdi.uoregon.edu> In-Reply-To: <19980525094043.M15604@freebie.lemis.com>
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On Mon, 25 May 1998, Greg Lehey wrote: > > Given you have a very fast machine to start with (like a fast P5 or > > faster), bus-master DMA does help alot. There is a very noticable > > difference in responsiveness of the system under load with the > > DMA. I actually wasn't convinced until I mistakenly built a system > > without the DMA, and noticed that it was somehow "slow." > > I was recently rather astonished with the performance of modern IDE > drives, and spent some time comparing the time for a 'make world' on > a K6/233 with 96 MB of memory. Here are the results for an IBM DORS > SCSI drive with an Adaptec 2940 host adaptor, and an IBM DHEA IDE > drive with normal and Ultra DMA: > > Disk Elapsed User System > > DORS 126m22.811s 66m2.051s 16m28.411s > DHEA 124m54.116s 65m3.465s 18m50.257s > DHEA/Ultra 111m21.743s 66m24.344s 18m37.329s Yeah, but were you doing anything at the time? IDE kills interactive response. Doug White | University of Oregon Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant http://gladstone.uoregon.edu/~dwhite | Computer Science Major To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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